. >>> one u.s. soldier killed and three wounded after a suicide attack on a nato base in afghanistan moments after a visit is by secretary of defense leon panetta. panetta met with commanders and spoke to u.s. troops at the base before returning to kabul to meet with afghan president, hamid karzai. during a joint news conference, panetta invited karzai to washington to meet with president obama at the white house. we are joined live from kabul. do we know president karzai's response to that invitt nation it comes at an interesting time he gave a controversial interview blaming the u.s. and nato for some of the problems he sees existing in afghanistan. >> reporter: he blamed some of the insecurity here, in part on u.s. and nato forces, their continued presence, their behavior toward the afghan people and the fact that they are still here. we don't yet know what will come of negotiations that are to be continuing next year, if karzai does, in fact, come to the states while necessary d.c. to meet with